Diaphragm for sound-reproducers.



J. Hi SU'MVE. nimm/mm ma some; Rsmmmsis,

Meu ned Miu'.

invent-0r Aitomeys 30 departing th 45 eter than .th'e disk 1;

STATES PATENT OFFICE.

J'AfiuEs n. s'U'TLIvn,

Be known .een i., .Janna n. vfsnnnwn,

fn eitizeibf-tiie-i1ntedi States, residing.. n Keokuk, infthecountyofLee. and State olfti Iowa, have invented-'a new 4and usefullDiaphraemnfori Sonn',d-Refpio 1iicei3s,v of which the following .isafspecication.

`This',invention'relate's todiaphragmslfor sound reproducersponefof itsobjects being' to provide "a compositediaphragm whereby the vibration'1i s distributed practically .equally over theentiiediaphragm and,consequentIy, the harshto esfso oftenproduced l during the -r'epro'duotoof h i'ghftones'are 1'5" avoided'while lift/.th

inne nii iones reroduoed are much in -renatural Abecause of t elargervibratingfsurflace.g A.

VA "furtherf'objeot i's.to' .provide'""a1 diaphragin which vcan besubstituted lreadilyfor n 20 `those now in use. I

With the .foregoing 'and votherobjects in view which l'will'-.i ilp'p'earas. the description roceeds,th'e invention-resides inthecominationand arrangementfof vparts' and Vin the details.of-constructionhereinafter deview of a diaphragm,constructedv in accord: ance withAthepresen't invention. Fig. 2 is,

anen1aigedse'ction therethrough. Fig. 3 is .an enlargedsectionthrough amodified form of diaphragm.

Referring Vto the figures by. .characters of 40 reference 1. designatesa'eenter disk of mica or other suitable sti'if :materialand this disk isinterposed .between'two layers of softer material such as raw-hide,these layers being indicated at'2 and being of a'greater diam# Inassembling the parts a suitable adhesive is applied to the inner facesof the raw-hide disks 2 and these' disks, with the center diskinterposed between them and-concentric therewith, are

placed within a press and subjected to pressure so that. the three diskswill be held tightly together, theraw-hide disks being brought'to aknife edge at their peripheries and coming together close t'o the centerdisk sneciiieation of Letters Patent.

Application sied August 7, i9i4. seriai No. 855,667.

or Knoxux, IOWA.

. MAPI-inserm son SOUND-REPRODUCERS..

Patented Mar. 21, 1916.

'1 at a" point approximately equidistant from the'two faces of said disk1 and as shown in .".The suchsas herein described isplaced in a soundbox .and'secured in the .usual manner, the` raw-hide disks 2 beingengigedby thesound box, serving'to support e center disk las shown inFig. 2.' Thus it.

will'be seen that when the diaphragmisset in vibration, the soft or morereadily flexible -material .projecting beyond the periphery of the disklrwill permit'the diaphragm to vibrate equally practically throughoutits diameter so that the harshness or blasting heretofore producedbecauseof the insuffi-V .cient vibration of the diaphragmis eliminatedand a clear and better tone produced;

It has bee'nl found vthat under some conditions the disksca-n be of thesame diameterv I as shown -in Fig. 3, whereinv the mica diskfhas beenshwnat 3 and the raw-hideior other soft disks at 4.* The best results,however, are obtained' by extending the outer .disksbeyond the peripheryof the inner'or` .mica disk so that they'alonewill be clamped to thesound box. v In Fig. 2 a portion of. the sound box has been illustratedatv 5. p p What is claimed is 1. A diaphragm for sound reproducers,including a relatively stiff disk.,` and thin disks of rawhide aiixed toopposed faces ref spectively of said relatively stiff disk andprojecting beyond the peripheryr thereof, the.

pro] ecting portions of the rawhide disks being affixed to each other.

2. A diaphragm "m sound---reproducers,

including a relatively stiff disk, and thin. I.

disks of rawhide affixed to opposed faces respectively of saidrelatively stifi` and projecting beyond .theV periphery thereof, theprojecting portions of the rawhide disks being afiixed to each other,said rawhide' disks being of equal tension. and adhering with equaltenacity to the first named disk, thereby to maintain the' diaphragmnormally in its intermediate position.

In testimony that I claimnthe foregoing as my own, I have hereto afxedmy signature in the presence of two witnesses.

JAMES H. SUTLIVE.

Witnesses:

G. W. Gunmen, S; H. CHESNUT. l

